US export rules focus mainly on national-security criteria, says Clif Burns, a partner at Powell Goldstein LLP in Washington and editor of exportlawblog.com. "It may well be the case that something doesn't have a [security] impact on the US but is otherwise improper or not good citizenship to export," says Mr. Burns.

The only cases where censorware cannot be sold, he says, involve certain forms of encryption or countries under broad US trade sanctions. In the case of Burma, sanctions probably don't outlaw a sale, he says, because the sanctions mostly prohibit imports from Burma, not exports of US goods to it.

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